I continue to have problems with organizer "not Responding" when I do a compatibility check in 7 it reports an "incompatible application"
all of the prior suggestions have been installed. Many times the organizer wont even load.
Thanks

1. Launch the Organizer while holding down the Shift key (timing can be tricky, but if done correctly, you should see the Catalog Manager, not the Organizer).
2. In the Catalog Manager, create a new catalog.
3. The new blank catalog should allows the Organizer to launch and run without issue.
4. Go to Preferences>Media Analysis and uncheck all boxes. Click OK.
5. Go to File>Catalog to reopen the Catalog Manager and open your previous catalog.

How are you performing a compatibility check in Windows 7? What version of Photoshop Elements are you using? The latest versions are all compatible.

The root cause is likely attached to some file that is being auto analyzed. Do you have video files in your current catalog? If so, what format are they in and what codecs were used to encode them?